Enable analyzers; clean up missing docs, code order, etc.

[tillig]

This enables several Roslyn analyzers that we hadn't previously enabled - things like missing/empty docs, code member ordering, checks for complexity, and so on. These were sort of "tech debt" things that would just take a while to enable and fix. I bit the bullet and fixed it. Hopefully this strikes a balance between "flexibility" and "order."

This is in preparation for the .NET 10 release, at which time we can remove some of the older targets and possibly get improved analyzer warnings. Should that happen, the major Autofac release would be a good time to take on any changes that could help with code maintenance.

No actual functional code changes took place. This is just reordering and adding missing docs. The complexity checks didn't fire off and issue any warnings. Unclear is due to the currently targeted frameworks.

I did notice we can't easily update the development dependencies like the test SDK while still targeting lower frameworks, so while a few dev dependencies were updated, many were not.

[codecov]

Codecov Report

❌ Patch coverage is 74.38017% with 93 lines in your changes missing coverage. Please review.
✅ Project coverage is 77.98%. Comparing base (ab7ca4d) to head (10cecca).

Files with missing lines	Patch %	Lines
...Autofac/Core/Registration/ComponentRegistration.cs	45.00%	11 Missing ⚠️
src/Autofac/Core/Lifetime/LifetimeScope.cs	84.37%	4 Missing and 6 partials ⚠️
.../Features/OpenGenerics/OpenGenericServiceBinder.cs	52.63%	5 Missing and 4 partials ⚠️
src/Autofac/Core/Container.cs	27.27%	8 Missing ⚠️
...tofac/Core/Registration/ServiceRegistrationInfo.cs	60.00%	4 Missing and 4 partials ⚠️
src/Autofac/Core/ResolvedParameter.cs	53.33%	3 Missing and 4 partials ⚠️
...Generics/OpenGenericDecoratorRegistrationSource.cs	0.00%	7 Missing ⚠️
...ac/Features/GeneratedFactories/FactoryGenerator.cs	16.66%	3 Missing and 2 partials ⚠️
...ofac/Core/Registration/ComponentRegistryBuilder.cs	84.00%	4 Missing ⚠️
src/Autofac/Core/Resolving/SegmentedStack.cs	20.00%	4 Missing ⚠️
... and 14 more

Additional details and impacted files

@@           Coverage Diff            @@
##           develop    #1468   +/-   ##
========================================
  Coverage    77.98%   77.98%           
========================================
  Files          211      211           
  Lines         5414     5414           
  Branches      1150     1150           
========================================
  Hits          4222     4222           
  Misses         693      693           
  Partials       499      499           

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